package com.allqj;

import java.util.Optional;

/**
 * @author sjw
 * @className aaaa
 * @date 2022/7/20 15:46
 * @description: TODO
 */
public class aaaa {
    public static void main(String[] args) {
        Optional<String> a=Optional.empty();
        if(a.isPresent()) System.out.println("aaa");
//        a.orElseThrow()
        a.get();
    }
}
